The Collaborative International Dictionary of English v.0.48:

Cloture \Cl[^o]`ture"\, n. [F.] (Parliamentary Practice)
   See Closure, 5.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cloture
    n 1: a rule for limiting or ending debate in a deliberative body
         [syn: closure, cloture, gag rule, gag law]
    v 1: terminate debate by calling for a vote; "debate was
         closured"; "cloture the discussion" [syn: closure,
         cloture]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "cloture":
   cloture by compartment, committee consideration, debate,
   deliberation, division, filibuster, filibustering, filing,
   first reading, guillotine, introduction, kangaroo cloture,
   logrolling, roll call, second reading, steamroller methods,
   tabling, talkathon, third reading, vote